[asterisk] adding integration

[truthbk]

What's this PR do?

Adds an integration for the Asterisk PBX.

For more information check
https://github.com/mafairnet/Asterisk-PBX-Integration-for-Datadog

Originally written by @mafairnet (DataDog/dd-agent#2916)

[stale]

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[jeremy-lq]

@mafairnet

If you're still interested in having this merged and are willing to become the maintainer, please let us know. I'm happy to explain the process a bit more if you have questions. Also note we have Office Hours today if you'd like to chat about this real-time. Thank you for the contribution.

[stale]

This issue has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed if no further activity occurs in the next two weeks. Thank you for participating in the Datadog open source community. If you need more time, or have any questions, let us know.

[mafairnet]

@jeremy-lq Hi! Of course I'm still interested. I'll write you when I'll get to the office.
Regards, Miguel.

[jeremy-lq]

Thanks for the update @mafairnet. If you need anything from us, let me know.

[stale]

This issue has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed if no further activity occurs in the next two weeks. Thank you for participating in the Datadog open source community. If you need more time, or have any questions, let us know.